Analysis and design of multilayer Jaumann absorbers

Li, Ké; Zhang, Xin; Hou, Xinyu; Zhang, Peng

doi:10.1109/icmtce.2011.5915168

Cited by 14 publications

(6 citation statements)

References 5 publications

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“…Further improvements to the absorption of light in such thin metallic films are straightforward. In particular, building on work using a metallic absorber in a dielectric cavity 26 , the reflection from the top surface could be reduced and a resonant cavity created in what is effectively an optical frequency Jaumann layer 27 . A metallic structure could be used in tandem with existing photovoltaic cells and a standard process, replacing or enhancing existing metallisations.…”

Section: Discussionmentioning

confidence: 99%

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A metallic hot-carrier photovoltaic device

Dimmock

Kauer²,

et al. 2019

Semicond. Sci. Technol.

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Hot carrier solar cells overcome the fundamental limitations of conventional devices where charge carriers are photogenerated over a broad energy spectrum but rapidly lose energy to the lattice and are extracted at the lowest energy of the system. In a hot carrier photovoltaic cell, carriers are extracted at higher energies than the absorption threshold, and extraction proceeds sufficiently quickly to avoid dissipative energy loss. We demonstrate a new hot carrier photovoltaic device where a broad spectrum of light is absorbed in metallic layers tens of nanometers thick. Using a semiconductor quantum well resonant tunnel structure we demonstrate energy selective hot carrier extraction from the metal film and show a unique hot carrier signature in the device IV characteristics. Using a multiple beam experiment, we further prove that these carriers arise from a hot electron population rather than via internal photoemission; a necessary requirement for high efficiency photovoltaic operation.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A metallic hot-carrier photovoltaic device

Dimmock

Kauer²,

et al. 2019

Semicond. Sci. Technol.

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“…Reflectivity R in Salisbury configuration expresses as a function of the scattering parameters S 11 and S 21 , that are measured for a composite slab using a Vector Network Analyzer (VNA) in a waveguide configuration described in ref. [29].…”

Section: Microwave Absorption In Salisbury Configurationmentioning

confidence: 99%

Absorption Performances of PLA-Montmorillonite Nanocomposites Thin Films in Salisbury and Rozanov Configurations: Influence of Aging and Mechanical Recycling

Salah

Ouslimani²,

Danlée³

et al. 2022

Micromachines

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The present paper aims to address the crucial concern of pollution induced by growing plastic waste and electromagnetic interference (EMI). Nanocomposites combining poly(lactic acid) (PLA) and organo-modified montmorillonite (OMMT) are synthesized and compression molded into thin films. A first set of samples, referred as virgin, was kept as is, while a second set of samples were photochemically, thermally and hydrolytically aged before mechanical recycling via extruding and second compression molding, resulting in the so-called recycled composite. The electromagnetic (EM) properties with a focus on microwave absorption performances of virgin and recycled samples are compared for various thicknesses and weight concentrations of OMMT in PLA matrix. The EM performances are gauges by Rozanov and Salisbury structures that consist in one- and two-layer stacks of composite films back-coated by a metal foil. Characterization in Rozanov configuration shows an average absorption index over the Ka band of 29.3% and 21.1% for, respectively, virgin and recycled PLA reinforced with 4 wt.% OMMT. An optimization of the film thickness is proposed; up to 61.85% and 80% of absorption with a thickness of 1.4 mm and 3.75 mm, respectively, is reached with a metal back-coated rPLA-4%OMMT film. Characterization in Salisbury configuration gives advantage to the recycled structure with an average absorption of 49.6% for a total thickness of 1.4 mm. The requirements of EMI shielding are met by PLA-OMMT composites with a certain benefit of recycling process on EM performance.

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“…The Jaumann screen overcomes this limitation by placing more than one dielectric spacer at the cost of increasing the overall effective thickness. Hence, these absorber kinds are not recommended in real-time applications [3].…”

Section: Introductionmentioning

confidence: 99%

A novel modified circular ring-based broadband polarization-insensitive angular stable circuit analog absorber (CAA) for RCS applications

Shukoor

Dey

2022

Int. J. Microw. Wireless Technol.

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In this study, a compact modified circular ring-based circuit analog absorber (CAA) is proposed. It comprises a resistor-loaded frequency selective surface (FSS) underneath an FR-4 substrate, and the other end is terminated with a perfect electric conductor (PEC) separated by an air-spacer. The proposed design shows a minimum −10 dB reflectance from 10.55 to 36.03 GHz (25.48 GHz bandwidth and 109.4% fractional bandwidth) with two dips at 13.5 GHz and 35.23 GHz having reflectivity −17.18 dB and −24.9 dB, respectively. The existing four-fold circular symmetry architecture shows insensitivity for different polarization angles under normal incidences and up to 45° stability for Transverse Electric (TE) and Transverse Magnetic (TM) modes under oblique incidences. The proposed cell is compact with a periodicity of 0.193λL, and a thickness of 0.09λL, where λL is the free-space wavelength corresponding to the lowest frequency of the absorption band. The novelty of the design lies in the topology of using an underneath FSS to take advantage of effective permittivity control for both broader bandwidth and better angular stability. To demonstrate the ability of the proposed design, a 28 GHz microstrip patch antenna prototype is fabricated, and its radar cross section (RCS) is measured after loading with the absorber. A 15.15 dBsm RCS reduction is observed in comparison with the PEC. The authors strongly believe that the proposed design has potential applications such as RCS reduction and radio-frequency energy harvesting.

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Analysis and design of multilayer Jaumann absorbers

Cited by 14 publications

References 5 publications

A metallic hot-carrier photovoltaic device

A metallic hot-carrier photovoltaic device

Absorption Performances of PLA-Montmorillonite Nanocomposites Thin Films in Salisbury and Rozanov Configurations: Influence of Aging and Mechanical Recycling

A novel modified circular ring-based broadband polarization-insensitive angular stable circuit analog absorber (CAA) for RCS applications

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